Showdown in the Sands

Answer "Yes" to return to the Celcius so you can gear up and save. When you beam back down, you'll immediately begin the battle against Angra Mainyu. After defeating it, you'll get Mercurial Strike grid.

Walkthrough:
Required: No
Description: The fiend that was ousted from the Cactuar Nation is raiding the Al Bhed camp! Wipe it out once and for all... Gullwings style.
Objective: The demon of the desert must fall!